I have a check engine light on and the code number is po 171

maybe you have a lean mixture

FIRST, WITHOUT THE ENGINE ON CHECK ALL YOUR VACUUM LINES AND CONNECTIONS FOR CRACKS OR JUST NOT BEING CONNECTED. THEN START THE CAR AND LISTEN FOR A HISSING SOUND. IF EVERYTHING IS NORMAL SHUT OFF THE CAR AND UNPLUG ANY CONNECTOR YOU CAN FIND ON THE ENGINE AND RECONNECT. DO NOT BREAK THE CLIPS. THEN LOOK AROUND THE ENGINE COMP. AND LOCATE WHERE THERE ARE WIRES BOLTED OR SCREWED TO THE ENGINE OR THE BODY. TAKE THEM LOOSE AND CLEAN ALL SURFACES WITH A WIRE BRUSH OR FINE GRIT SANDPAPER AND REATTACH TIGHTLY BUT DO NOT BREAK THE BOLTS BY OVER-TIGHTENING. YOU CAN ALSO RUN SOME INJECTOR CLEANER IN THE FUEL, BG CHEMICAL'S 44K IS ONE OF THE BEST. GOOD LUCK